644 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Strawberries. By J. Oskamp {U.S.A. Exp. Stn., Purdue, Bull. 

 164, 1914 ; figs.). — Cultivation of the Strawberry, report of variety test, 

 and descriptions of many varieties. — E. A. Bd. 



Streptocarpus x Banksii. By R. I. Lynch (Gard. Chron. 

 September 12, 1914, p. 192 ; with fig.). — A new hybrid raised at 

 Cambridge between S. Wendlandii $ and a named form of the usually 

 grown hybrid strain as ? . A fine, free-flowering plant, with purple 

 flowers. — E. A. B. 



Streptocarpus x Blythinii. By R I. Lynch {Gard. Chron. October 

 17, 1914, p. 258; with fig.). — S. cyaneus $ and S. Wendlandii Y have 

 produced a hybrid with lavender-coloured flowers and large, hand- 

 some leaves. — E. A. B. 



Thermotropism of Roots. By Sophia Eckerson {Bot. Gaz. Iviii. 

 pp. 254-263, Sept. 1914 ; 6 figs.). — The author found that Raphanus 

 roots showed positive curvature when grown in the thermostat at 

 7°-i5° C. temperature ; at i6°-23° C. no curvature ; 24°-36° C. positive 

 and at 38°-5i° negative curvature. Pisum roots showed positive 

 reaction at 8-15° C, no curvature iy°~2g° C, and negative at 34°-5o° C. 



She then examined the permeability of the root protoplasm of 

 these plants at varied temperatures, and found increased permeability 

 in Raphanus, Pisum, and other plants at temperatures corresponding 

 to positive curvature. There was no change in permeability when 

 there was no thermotropic reaction, and a decrease in permeability 

 at those temperatures which produced negative thermotropism. 



She concludes that with unequal temperature on opposite sides of 

 a root, the root will curve only if the cells are more permeable at one of 

 these temperatures than they are at the other. The more permeable 

 cells are less turgid, and so the more permeable side of the root becomes 

 concave. — G. F. S. E. 



Thrips in Orchards. By W. B. Gurney [Agr. Gaz. N.S.W, 

 vol. XXV. pp. 685-687). — To prevent the damage caused by thrips 

 to late apples and cherries, the weeds, dead refuse, and green manure 

 between the trees should be turned over and the soil ploughed as near 

 to the trees as possible. Spray the trees, as late as possible before the 

 buds open, with Hme-sulphur mixture. As the buds open, spray 

 once or twice with tobacco wash. — S. E. W. 



Thymol, Sources of. Anon. {Perfumery Record, Oct. 1914, 

 p. 374). — Ajowan seeds grown in India, Persia, Afghanistan, and 

 Egypt are the most important source of this valuable product, but 

 it is pointed out that Origanum hirtum. Thymus vulgaris and other 

 thymes, Monarda punctata, Mosla japonica, and Satureja Thymhra 

 are likely to yield considerable quantity. Species ahied to those 

 named usually contain carvacrol. — F. J. C. 



Tobacco Wash. By W. Le Gay Brereton {Agr. Gaz. N.S.W. vol. 

 XXV. p. 310). — A useful summer spray for aphis and American blight 

 is prepared by immersing 100 lb. of tobacco stalks in water. Add 3 lb. 



